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  • The blades of a windmill sweep out a circle of area A. What is the kinetic energy of the air ?

Q21 (b)   The blades of a windmill sweep out a circle of area A. What is the kinetic energy of the air? 

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The kinetic energy is given by :

                                                    =\ \frac{1}{2}mv^2

or                                                =\ \frac{1}{2}\ \rho Avt\ v^2

or                                              =\ \frac{1}{2}\ \rho At\ v^3

Thus the kinetic energy of wind is      \frac{1}{2}\ \rho At\ v^3  J.

Posted by

Devendra Khairwa

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